diff --git a/lib/assert.js b/lib/assert.js
index 3c1435d4a..b3b1d47d7 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -2,8 +2,7 @@
 const concordance = require('concordance');
 const isError = require('is-error');
 const isPromise = require('is-promise');
-const concordanceOptions = require('./concordance-options').default;
-const concordanceDiffOptions = require('./concordance-options').diff;
+const {default: concordanceOptions, diff: concordanceDiffOptions} = require('./concordance-options').resolve();
 const snapshotManager = require('./snapshot-manager');
 
 function formatDescriptorDiff(actualDescriptor, expectedDescriptor, options) {
diff --git a/lib/cli.js b/lib/cli.js
index e85be8c3e..a3b5296d9 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -180,6 +180,7 @@ exports.run = async () => { // eslint-disable-line complexity
 
 	const chalkOptions = {level: combined.color === false ? 0 : require('chalk').level};
 	const chalk = require('./chalk').set(chalkOptions);
+	require('./concordance-options').configure();
 
 	if (confError) {
 		if (confError.parent) {
diff --git a/lib/concordance-options.js b/lib/concordance-options.js
index 5af411cc9..47859194a 100644
--- a/lib/concordance-options.js
+++ b/lib/concordance-options.js
@@ -3,14 +3,9 @@ const util = require('util');
 const ansiStyles = require('ansi-styles');
 const stripAnsi = require('strip-ansi');
 const cloneDeepWith = require('lodash/cloneDeepWith');
-const reactPlugin = require('@concordance/react');
+const merge = require('lodash/merge');
 const chalk = require('./chalk').get();
 
-// Wrap Concordance's React plugin. Change the name to avoid collisions if in
-// the future users can register plugins themselves.
-const avaReactPlugin = {...reactPlugin, name: 'ava-plugin-react'};
-const plugins = [avaReactPlugin];
-
 const forceColor = new chalk.Instance({level: Math.max(chalk.level, 1)});
 
 const colorTheme = {
@@ -52,34 +47,6 @@ const colorTheme = {
 		keyBracket: {open: forceColor.grey('['), close: forceColor.grey(']')},
 		valueFallback: forceColor.grey('…')
 	},
-	react: {
-		functionType: forceColor.grey('\u235F'),
-		openTag: {
-			start: forceColor.grey('<'),
-			end: forceColor.grey('>'),
-			selfClose: forceColor.grey('/'),
-			selfCloseVoid: ' ' + forceColor.grey('/')
-		},
-		closeTag: {
-			open: forceColor.grey('</'),
-			close: forceColor.grey('>')
-		},
-		tagName: ansiStyles.magenta,
-		attribute: {
-			separator: '=',
-			value: {
-				openBracket: forceColor.grey('{'),
-				closeBracket: forceColor.grey('}'),
-				string: {
-					line: {open: forceColor.blue('"'), close: forceColor.blue('"'), escapeQuote: '"'}
-				}
-			}
-		},
-		child: {
-			openBracket: forceColor.grey('{'),
-			closeBracket: forceColor.grey('}')
-		}
-	},
 	regexp: {
 		source: {open: ansiStyles.blue.open + '/', close: '/' + ansiStyles.blue.close},
 		flags: ansiStyles.yellow
@@ -118,22 +85,55 @@ const colorTheme = {
 	undefined: ansiStyles.yellow
 };
 
-const plainTheme = cloneDeepWith(colorTheme, value => {
-	if (typeof value === 'string') {
-		return stripAnsi(value);
+let resolved = null;
+exports.resolve = () => {
+	if (!resolved) {
+		throw new Error('Concordance options have not yet been configured');
 	}
-});
 
-const theme = chalk.level > 0 ? colorTheme : plainTheme;
+	return resolved;
+};
 
-exports.default = {
-	// Use Node's object inspection depth, clamped to a minimum of 3
-	get maxDepth() {
-		return Math.max(3, util.inspect.defaultOptions.depth);
-	},
-	plugins,
-	theme
+exports.configure = plugins => {
+	if (resolved) {
+		throw new Error('Concordance options have already been configured');
+	}
+
+	// TODO: Remove in the next major release.
+	if (plugins === undefined) {
+		const avaReactPlugin = require('./legacy-react');
+
+		plugins = [avaReactPlugin];
+	} else {
+		// TODO: Resolve plugins
+	}
+
+	const resolvedTheme = plugins.reduce((theme, {themeOverride}) => {
+		return merge(theme, themeOverride);
+	}, colorTheme);
+
+	const plainTheme = cloneDeepWith(resolvedTheme, value => {
+		if (typeof value === 'string') {
+			return stripAnsi(value);
+		}
+	});
+
+	const theme = chalk.level > 0 ? resolvedTheme : plainTheme;
+
+	plugins = plugins.map(({themeOverride: _, ...plugin}) => plugin);
+
+	resolved = {
+		default: {
+		// Use Node's object inspection depth, clamped to a minimum of 3
+			get maxDepth() {
+				return Math.max(3, util.inspect.defaultOptions.depth);
+			},
+			plugins,
+			theme
+		},
+
+		diff: {maxDepth: 1, plugins, theme},
+		snapshotManager: {plugins, theme: plainTheme}
+	};
 };
 
-exports.diff = {maxDepth: 1, plugins, theme};
-exports.snapshotManager = {plugins, theme: plainTheme};
diff --git a/lib/legacy-react.js b/lib/legacy-react.js
new file mode 100644
index 000000000..2774777b9
--- /dev/null
+++ b/lib/legacy-react.js
@@ -0,0 +1,41 @@
+'use strict';
+const ansiStyles = require('ansi-styles');
+const reactPlugin = require('@concordance/react');
+const chalk = require('./chalk').get();
+
+const forceColor = new chalk.Instance({level: Math.max(chalk.level, 1)});
+
+module.exports = {
+	...reactPlugin,
+	name: 'ava-plugin-react',
+	themeOverride: {
+		react: {
+			functionType: forceColor.grey('\u235F'),
+			openTag: {
+				start: forceColor.grey('<'),
+				end: forceColor.grey('>'),
+				selfClose: forceColor.grey('/'),
+				selfCloseVoid: ' ' + forceColor.grey('/')
+			},
+			closeTag: {
+				open: forceColor.grey('</'),
+				close: forceColor.grey('>')
+			},
+			tagName: ansiStyles.magenta,
+			attribute: {
+				separator: '=',
+				value: {
+					openBracket: forceColor.grey('{'),
+					closeBracket: forceColor.grey('}'),
+					string: {
+						line: {open: forceColor.blue('"'), close: forceColor.blue('"'), escapeQuote: '"'}
+					}
+				}
+			},
+			child: {
+				openBracket: forceColor.grey('{'),
+				closeBracket: forceColor.grey('}')
+			}
+		}
+	}
+};
diff --git a/lib/serialize-error.js b/lib/serialize-error.js
index 114b9a28e..eefacf627 100644
--- a/lib/serialize-error.js
+++ b/lib/serialize-error.js
@@ -6,7 +6,7 @@ const isError = require('is-error');
 const StackUtils = require('stack-utils');
 const assert = require('./assert');
 const beautifyStack = require('./beautify-stack');
-const concordanceOptions = require('./concordance-options').default;
+const {default: concordanceOptions} = require('./concordance-options').resolve();
 
 function isAvaAssertionError(source) {
 	return source instanceof assert.AssertionError;
diff --git a/lib/snapshot-manager.js b/lib/snapshot-manager.js
index bcb448c01..ad0604a0b 100644
--- a/lib/snapshot-manager.js
+++ b/lib/snapshot-manager.js
@@ -12,7 +12,7 @@ const convertSourceMap = require('convert-source-map');
 const slash = require('slash');
 const writeFileAtomic = require('write-file-atomic');
 
-const concordanceOptions = require('./concordance-options').snapshotManager;
+const {snapshotManager: concordanceOptions} = require('./concordance-options').resolve();
 
 // Increment if encoding layout or Concordance serialization versions change. Previous AVA versions will not be able to
 // decode buffers generated by a newer version, so changing this value will require a major version bump of AVA itself.
diff --git a/lib/test.js b/lib/test.js
index 096978c9f..c23a9da92 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -5,7 +5,7 @@ const plur = require('plur');
 const assert = require('./assert');
 const nowAndTimers = require('./now-and-timers');
 const parseTestArgs = require('./parse-test-args');
-const concordanceOptions = require('./concordance-options').default;
+const {default: concordanceOptions} = require('./concordance-options').resolve();
 
 function formatErrorValue(label, error) {
 	const formatted = concordance.format(error, concordanceOptions);
diff --git a/lib/worker/subprocess.js b/lib/worker/subprocess.js
index b0e8f45c1..07a3bf994 100644
--- a/lib/worker/subprocess.js
+++ b/lib/worker/subprocess.js
@@ -19,6 +19,7 @@ ipc.send({type: 'ready-for-options'});
 ipc.options.then(async options => {
 	require('./options').set(options);
 	require('../chalk').set(options.chalkOptions);
+	require('../concordance-options').configure(options.plugins);
 
 	if (options.chalkOptions.level > 0) {
 		const {stdout, stderr} = process;
diff --git a/test/api.js b/test/api.js
index ec96546e5..057fe4d57 100644
--- a/test/api.js
+++ b/test/api.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 
 const path = require('path');
 const fs = require('fs');
diff --git a/test/assert.js b/test/assert.js
index 48d5dd4c9..fff65aec1 100644
--- a/test/assert.js
+++ b/test/assert.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({chalkOptions: {level: 0}});
 
 const path = require('path');
diff --git a/test/beautify-stack.js b/test/beautify-stack.js
index c8ef34032..f9c49f7b6 100644
--- a/test/beautify-stack.js
+++ b/test/beautify-stack.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const proxyquire = require('proxyquire').noPreserveCache();
diff --git a/test/code-excerpt.js b/test/code-excerpt.js
index cff1b3c48..506b61289 100644
--- a/test/code-excerpt.js
+++ b/test/code-excerpt.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set({level: 1});
+require('../lib/concordance-options').configure();
 
 const fs = require('fs');
 const tempWrite = require('temp-write');
diff --git a/test/helper/fix-reporter-env.js b/test/helper/fix-reporter-env.js
index a40f37f40..1d89416d7 100644
--- a/test/helper/fix-reporter-env.js
+++ b/test/helper/fix-reporter-env.js
@@ -22,6 +22,7 @@ module.exports = () => {
 
 	fixColors();
 	require('../../lib/chalk').set({level: 3});
+	require('../../lib/concordance-options').configure();
 
 	return {
 		restoreClock() {
diff --git a/test/hooks.js b/test/hooks.js
index 86d2007b4..ac8babb4e 100644
--- a/test/hooks.js
+++ b/test/hooks.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const {test} = require('tap');
diff --git a/test/observable.js b/test/observable.js
index 6ae86bc32..2fd1218c1 100644
--- a/test/observable.js
+++ b/test/observable.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const {test} = require('tap');
diff --git a/test/promise.js b/test/promise.js
index b38bf2444..8c8f5b25d 100644
--- a/test/promise.js
+++ b/test/promise.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set({level: 0});
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const {test} = require('tap');
diff --git a/test/runner.js b/test/runner.js
index d93ecb627..bf20fa899 100644
--- a/test/runner.js
+++ b/test/runner.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const {test} = require('tap');
diff --git a/test/serialize-error.js b/test/serialize-error.js
index 4f4874dae..ad9b86c50 100644
--- a/test/serialize-error.js
+++ b/test/serialize-error.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const fs = require('fs');
diff --git a/test/test-try-commit.js b/test/test-try-commit.js
index adc0ce44e..4fd2f0a21 100644
--- a/test/test-try-commit.js
+++ b/test/test-try-commit.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({chalkOptions: {level: 0}});
 
 const {test} = require('tap');
diff --git a/test/test.js b/test/test.js
index e602e0308..89b6491c4 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set({level: 0});
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({});
 
 const path = require('path');
diff --git a/test/try-snapshot.js b/test/try-snapshot.js
index e15bf1f01..4006ae71d 100644
--- a/test/try-snapshot.js
+++ b/test/try-snapshot.js
@@ -1,5 +1,6 @@
 'use strict';
 require('../lib/chalk').set();
+require('../lib/concordance-options').configure();
 require('../lib/worker/options').set({chalkOptions: {level: 0}});
 
 const path = require('path');
diff --git a/test/watcher.js b/test/watcher.js
index 205cb033e..d77177522 100644
--- a/test/watcher.js
+++ b/test/watcher.js
@@ -11,6 +11,7 @@ const {normalizeGlobs} = require('../lib/globs');
 const {setImmediate} = require('../lib/now-and-timers');
 
 require('../lib/chalk').set({});
+require('../lib/concordance-options').configure();
 
 // Helper to make using beforeEach less arduous
 function makeGroup(test) {